Focus state detection device

Details Focus state detection device Focus state detection device

1997-04-28

1998-10-13

Metjahic, Safet

Photography

With exposure objective focusing means, focusing aid, or...

Plural focusing or rangefinding areas

396114, 396119, 396268, G03B 1336

Patent

active

058226273

ABSTRACT:
A compact focus state detection device having a plurality of focus state detection areas at the center of and away from the center of the photo field. A first focus state detection optical system has focus state detection areas away from the center of the photo field and in a direction substantially perpendicular to the radial direction from the center point. The optical axis of each re-imaging lens of the first focus state detection optical system is decentered toward the optical axis of the shooting lens from the center of each corresponding aperture stop. Therefore, when focus state detection light rays pass through the re-imaging lens, the exit direction of the light rays deflects toward the optical axis of the shooting lens.

REFERENCES:
patent: 4857718 (1989-08-01), Karasaki et al.
patent: 4903066 (1990-02-01), Moriyama et al.
patent: 5233173 (1993-08-01), Moriyama
patent: 5257062 (1993-10-01), Moriyama
patent: 5262819 (1993-11-01), Ohtaka et al.

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